Thermal effects on cathodoluminescence in forsterite

Hirotsugu Nishido, Taro Endo, Kiyotaka Ninagawa, Masahiro Kayama, Arnold Gucsik

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Cathodoluminescence (CL) spectral analysis has been conducted for luminescent forsterite (olivine) of terrestrial and meteoritic origins. Two emission bands at 3.15 and 2.99 eV in blue region can be assigned to structural defect centres and two emission bands at 1.91 and 1.74 eV in red region to impurity centres of Mn2+ and Cr3+, respectively. These emissions reduce their intensities at higher temperature, suggesting a temperature quenching phenomenon. The activation energy in the quench-ing process was estimated by a least-square fitting of the Arrhenius plots using integrated intensity of each component as follows; blue emissions at 3.15 eV: 0.08-0.10 eV and at 2.99 eV: 0.09-0.11 eV, red emissions at 1.91 eV: ∼0.01 eV and at 1.74 eV: ∼0.02 eV. The quenching process can be con-strued by the non-radiative transition by assuming the Mott-Seitz model. The values of activation en-ergies for blue emissions caused by structural defects correspond to the vibration energy of Si-O stretching mode in the lattice, and the values for red emissions caused by Mn and Cr impurity centres to Mg-O vibration energy. It implies that the temperature quenching energy might be transferred as a phonon to the specific lattice vibration.

Original languageEnglish
Pages (from-to)239-243
Number of pages5
JournalGeochronometria
Volume40
Issue number4
DOIs
Publication statusPublished - 2013 Dec

Keywords

  • Cathodoluminescence
  • Forsterite
  • Thermal effect

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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